Loved the "Twelfth Night" reference. I'm playing Viola on stage on Sunday, so I guessed it would be referenced from the moment they mentioned the Day of the 12th. :)
Somehow I also think that it's a hint, since that play involves cross-dressing and confusion, and everyone supposes that Cesario is a guy when in fact she is a girl, Viola, posing as one.
From the few chapters back I strongly suspect that the son everyone will be searching for is actually a girl, MC. Or maybe it'll somehow be about the twins separated.